22. Which of the following is diamagnetic?
(A)N₂
(B)
(C)O₂
(D)
(E)

23. Which of the following statements is true? (A) a triple bond is composed of two a bonds and one x bond. (B)σ bonds result from the head-to-head overlap of atomic orbitals. (C) Free rotation may occur about a double bond. (D) x bonds have electron density on the internuclear axis. (E) the Lewis structure for C2H2 shows single bonds and one double bond.

24. Which of the following statements best describes BF3 and NF3? (Nole: Geometry refers to the electron pair arrangement, and shape refers to the atom arrangement.) (A)they have variable geometries and shapes due to their potential resonance structures. (B)they have the same geome etry and different shapes. (C)they have the same geometry and the same shape. (D)they have different geometries and different shapes. (E)they have different geometries and the same shape.

25. Which of the following molecules has a dipole moment? (A)SF4 (B)CF4 (C)XeF4 (D)SF6(E)XcF2

26. How many resonance structures does the have? (A)0 (B)1 (C)2 (D)3 (E)4

27. The first ionization energy of magnesium is approximately 700 kJ/mol. What is a good estimate for the second ond ionization n energy(k.I/mol) of mag gnesium? (A)-700(B)700 (C)-1400(D)1400(E)70,000

28. For any operating concentration cell, which of the following statements is true? (A)E and E°must both be positive. (B)E must be zero and E°must be positive (C)E° must be zero and E must be positive. (D)E and E° must both be negative. (E)E° must be positive and E must be negative.

29. For any galvanic cell to operate, which of the following statements is true? (A)△G° and E° must both be positive. (B)△G° must be negative and E° must be positive. (C)△G° and E' must both be negative. (D)△G° must be positive and E° must be negative. (E)△G° must be zero and E° must be negative.

30. In which case must a reaction be spontaneous at all temperatures? (A)△H is positive, and △S is positive. (B)△H is negative. and △S is negative. (C)△H is positive, and △S is negative. (D)△H is negative, and △S is positive. (E)△H = 0, and △S = 0.

31. Which is the percent dissociation of HF in a solution containing both 1.0 M HF and 1.0 M NaF ? (A)0.072%(B)0.27% (C)0.72% (D)2.7%(E)7.2%

32. Which is the mathematical expression of solubility product(Ksp) for the molar solubility(S) in (mol/L) of Fe3(PO4)2? (A)S2 (B)6S2 (C)12S3(D)6S5 (E)108S5

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